Thule Bexey Dog Bed – Medium. The Thule Bexey dog bed accessory offers extra comfort and padding a simple yet significant upgrade from the trailers already-included padded floor. Its designed to make every journey more enjoyable for your dog providing a snug and secure spot to relax whether youre headed to the park or exploring new trails together. The dog bed accessory is quick and easy to install using velcro straps. The durable outer material of the bed is designed to resist scratches from your dog and can easily be removed using a zipper for a hand wash.